Risky business: photography edition

A professional photographer was placed in a terrorism investigation database after attempting to photograph Dorchester, MA's gas storage tank, which looks like this:

The artwork is titled 'Rainbow Swash,' and it's reportedly "historic." It has a Wikipedia page, so that must be right.

In any case, there seems to be little justification for subjecting citizens to surveillance for activities as routine as photographing artwork. What's next? Does the government intend to monitor anybody caught photographing the Golden Gate Bridge? The Capitol?